It sounds like some people need to take an economics course or two. Yes if we allow more workes from other countries here, the cost per worker will go down (most people know that).
People who are paid less spend less, so you have fewer customers. Also as you allow more workers here, there are fewer workers for jobs in other countries. So people who are less qualified will fill those positions (you thought imported stuff is crap, just wait).
The people who are most qualified will gravitate to better paying jobs, leaving most companies with lower paid people, who are less qualified (Why does this copier keep breaking).
Why don't we just allow more business people and pay the business people less. Same with lawyers.
Apperently there is a shortage of truck drivers, so if pay decreases below that of truck drivers, then people will gravitate there.